What makes a christian?
A) Holding set of dogmatics to be true, following christian moral rules and taking part in traditional christian-related practises such as going to church?
B) Having experiential contact with spiritual being, which introduces itself as Jesus?
For arguments sake, lets call A "religion" and B "relationship". What makes person a christian? Is it religion or relationship or both?
If there is B, is A necessary? Or other way around?
What is relationship of A and B in christian faith?
More A than B.
Christianity is a confessional religion, involving the confession of certain things to be true: Namely that Jesus is the Christ, and that this Jesus Christ is Lord and the Son of God. What these things mean is outlined in the Nicene Creed, which is the summary of normative, orthodox Christian faith.
The nature of this confession is that God has a relationship with us through His own downward movement. That is, God comes down to meet us. The most central act of this encounter is in the person of Jesus, who being God in the flesh was the living encounter with Israel's God; for us we encounter this same Jesus through what we call "Means of Grace", specifically Word and Sacrament. In the preaching of the Gospel, in Baptism, and in the Lord's Supper.
As such the locus of the Christian religious experience is faith, to believe what we have heard and receive it as true and trustworthy, holding fast to it; to trust in the One we confess, hoping in Him and what He has promised.
It is neither in the "doing" of certain moral acts, nor in an esoteric, subjective experience. It is in the believing of certain objective realities, believing they are true, and trusting in what they mean. The "doing" comes out from that faith as that faith shapes us to interact with our neighbor in love and kindness, and to respond to God in prayer and thanksgiving. But it is never us reaching upward to God to try and grasp Him or meet Him through our own efforts, through our own experiences or moral efforts; but it is about God coming down to meet us in His gracious Word and Sacraments, and these forming and creating faith in us to believe, trust, and confess; and to then be shaped by this faith to the love of God and neighbor.
-CryptoLutheran